An underwater in-situ detection system based on laser induced breakdown spectroscopy

Abstract

The present invention provides an underwater in-situ detection system based on laser induced breakdown spectroscopy technology, and relates to the technical field of underwater in-situ detection systems. The underwater in-situ detection system based on laser induced breakdown spectroscopy technology comprises a base, a bracket is fixedly connected to the top of the base, a micro-air column generating module is fixedly connected to the inside of the bracket, an underwater peristaltic pump is fixedly connected to the top of the bracket, a fixing frame is fixedly connected to one side of the top of the base, and a constant pressure air bag is fixedly connected to the inside of the fixing frame. In the underwater in-situ detection system based on laser induced breakdown spectroscopy technology, the underwater peristaltic pump pumps the gas in the constant pressure air bag into the pipeline, and the air is ejected from the jet needle. At the same time, the underwater peristaltic pump pumps the clean seawater at the bottom of the constant pressure air bag into the second nozzle and the first nozzle to eject it, so as to achieve the purpose of protecting the air column.

Description

Technical Field

[0001] The invention relates to an underwater in-situ detection system, in particular to an underwater in-situ detection system based on laser induced breakdown spectroscopy technology, and belongs to the technical field of underwater in-situ detection systems. Background Art

[0002] Deep-sea metal mineral resources (such as polymetallic nodules, cobalt-rich crusts, and polymetallic sulfides) have been proven to have great mining value. Traditional sampling technology brings seabed samples back to the laboratory for analysis, which can accurately obtain chemical composition information from a certain location on the seabed, but the acquisition of information has a large lag, and cannot provide real-time rapid feedback and scientific regulation during the mining process, and it is difficult to conduct long-term, large-scale seabed surveys. Therefore, the future development of deep-sea mineral resources has put forward an urgent need for the development of fast, accurate, and environmentally friendly deep-sea in-situ detection technology.

[0003] Laser induced breakdown spectroscopy is a spectral analysis method that focuses a high peak power pulsed laser on the sample surface, allowing the laser to interact with the material, inducing breakdown to generate plasma and emit light. The emission spectrum of the plasma is analyzed to achieve qualitative and quantitative analysis of the test sample. The element information in the sample can be provided by analyzing the peak position. Laser Raman spectroscopy is a non-destructive molecular spectroscopy technology. The technology is based on the interaction between the excitation light and the molecules in the sample. The sample molecules produce scattered light of different wavelengths, which provides the vibration and rotation energy level information of the molecules in the form of frequency-shifted scattered photons. Therefore, Raman spectroscopy can provide molecular structure information in the sample. The system creates a millimeter-scale gas column in situ underwater and focuses the pulsed laser on the gas-liquid interface of the micro gas column to obtain an enhanced LIBS signal.

[0004] When the existing device forms the gas-liquid interface of the micro-air column, since the device is used underwater, when the underwater conditions are stable, it will not have much impact on the pulse laser emission. However, if the underwater conditions are poor, the water flow will be turbulent and the turbulence will affect the stability of the air column and at the same time affect the stability of the pulse laser. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] The purpose of the present invention is to provide an underwater in-situ detection system based on laser induced breakdown spectroscopy technology in order to solve the above-mentioned problems, so as to solve the problem in the prior art that, since the device is used underwater, when the underwater conditions are stable, there will not be much impact when the pulse laser is emitted, but if the underwater conditions are poor, the water flow will be turbulent and the turbulence will affect the stability of the air column and at the same time affect the stability of the pulse laser.

[0007] (II) Technical solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: an underwater in-situ detection system based on laser induced breakdown spectroscopy technology, comprising a base, a bracket fixedly connected to the top of the base, a micro-air column generating module fixedly connected to the inside of the bracket, an underwater peristaltic pump fixedly connected to the top of the bracket, a fixing frame fixedly connected to one side of the top of the base, a constant pressure air bag fixedly connected to the inside of the fixing frame, a connecting plate fixedly connected to the output end of the underwater peristaltic pump, three peristaltic pump heads fixedly connected to the front side of the connecting plate, an adjustment component is provided at one end of the micro-air column generating module, a first fixed plate is provided at one side of the adjustment component, a plurality of side plates are fixedly connected to one side of the first fixed plate, a second fixed plate is fixedly connected to one side of the plurality of side plates, The lower limit stop of the second sliding plate is slidably connected to the first sliding plate, and the lower limit stop of the second sliding plate is slidably connected to the first sliding plate. The lower limit stop of the second sliding plate is slidably connected to the first sliding plate, and the upper limit stop of the second sliding plate is slidably connected to the first nozzle. The lower limit stop of the second sliding plate is slidably connected to the second nozzle.

[0009] Preferably, a positioning plate is fixedly connected to the bottom of the support plate, a hydraulic cylinder is fixedly connected to one side of the positioning plate, a tooth plate is fixedly connected to the output end of the hydraulic cylinder, a spring is sleeved on the outer side of the output end of the hydraulic cylinder, both ends of the spring are respectively fitted with the tooth plate and the hydraulic cylinder, a first limit block is fixedly connected to the top front side of the tooth plate, the first limit block is fixedly connected to the bottom of the first fixed block, so that the hydraulic cylinder is started to drive the tooth plate to move, thereby causing the tooth plate to drive the first limit block to move, and the first limit block drives the first fixed block and the first nozzle to move.

[0010] Preferably, the bottom of the two second limit blocks are fixedly connected to a moving block, one side of the two moving blocks is fixedly connected to a rack, the two racks are arranged opposite to each other, and the two sides of the bottom of the support plate are fixedly connected to support blocks, the two racks respectively penetrate the two support blocks and are slidably connected to the two support blocks, so that the support blocks support the racks, and the moving blocks drive the racks to move.

[0011] Preferably, both sides of the bottom of the support plate are rotatably connected to the first support rods, the outer sides of the two first support rods are fixedly connected to the first gears, and the outer bottoms of the two first support rods are fixedly connected to the second gears, so that the first support rod drives the first gear and the second gear to rotate synchronously.

[0012] Preferably, the bottom of the support plate is rotatably connected to the second support rods on both sides, the tops of the two second support rods are fixedly connected to the third gears, the two third gears are respectively meshed and connected with the two first gears, and the two third gears are respectively meshed and connected to the two sides of the toothed plate, so that the toothed plate drives the two third gears to rotate when it moves, thereby driving the two first gears to rotate, and thereby driving the two first support rods and the second gears to rotate.

[0013] Preferably, the adjustment component includes a rotating sleeve, a threaded sleeve is arranged inside the rotating sleeve, and a through groove is concentrically arranged inside the rotating sleeve and the threaded sleeve. The outlet of the built-in laser emitter in the micro-air column generating module corresponds to the through groove, so that the laser emitter inside the micro-air column generating module can transmit the laser through the through groove without blocking the laser.

[0014] Preferably, limiting grooves are provided on both sides of the rotating sleeve, and guide blocks are fixedly connected to both sides of one end of the threaded sleeve. The two guide blocks are respectively slidably connected to the two limiting grooves, so that the limiting grooves limit the guide blocks, and the rotating sleeve drives the guide blocks and the threaded sleeve to rotate.

[0015] Preferably, the front side of the micro-air column generating module is fixedly connected to a support seat, and both sides of the front end of the support seat are fixedly connected to telescopic sleeves, the outer sides of the two telescopic sleeves are fixedly connected to a limiting plate, the threaded sleeve passes through the limiting plate and is threadedly connected to the limiting plate, and the limiting plate limits the threaded sleeve so that the threaded sleeve moves to one side when rotating. The front end of the limiting plate is rotatably connected to a swivel, and the swivel is fixedly connected to the first fixed plate, so that the threaded sleeve drives the swivel and the first fixed plate to move, and the two telescopic sleeves are slidably connected to the inside of the two telescopic sleeves, and the first fixed plate is fixedly connected to the two sliding rods, and the rotating sleeve is rotatably connected to the inside of the support seat, and the front side of the support seat is fixedly connected to an underwater motor, and the output end of the underwater motor is fixedly connected to a transmission gear, and the transmission gear is meshed with a gear ring, so that the underwater motor starts to drive the transmission gear to rotate, and drives the gear ring and the rotating sleeve to rotate.

[0016] Preferably, a pipe communicating with the outside is provided at the bottom of the constant pressure airbag, and the three peristaltic pump heads are all connected to the output end of the underwater peristaltic pump. When one of the peristaltic pump heads is started, the first connecting tubes are fixedly connected on both sides, and the two first connecting tubes are respectively connected to the suction needle and the air jet needle. The second peristaltic pump head is fixedly connected on both sides with the third connecting tubes, and the two third connecting tubes are respectively fixedly connected to the constant pressure airbag. The last peristaltic pump head is fixedly connected on both sides with the second connecting tubes, and the two second connecting tubes are respectively connected to the suction needle and the air jet needle.

[0017] Preferably, one side of the upper slider and the lower slider are rotatably connected to a threaded rod, the two threaded rods respectively pass through the upper and lower ends of the second fixed plate and are threadedly connected to the second fixed plate, and the two threaded rods extend to the outer end of the second fixed plate and are fixedly connected to a handle, and the upper slider is driven to move by rotating the threaded rod to adjust the upper slider.

[0018] The present invention provides an underwater in-situ detection system based on laser induced breakdown spectroscopy technology, which has the following beneficial effects:

[0019] 1. The underwater in-situ detection system based on laser induced breakdown spectroscopy technology is suspended in the water, or the device is installed on the outside of the AUV, and the AUV is loaded into the water for operation. When the system reaches the position, before the detection, the underwater peristaltic pump is started to drive the connecting plate and the peristaltic pump head, so that the peristaltic pump head transmits the water at the bottom of the constant pressure airbag to the first limit block and the second nozzle through the first connecting pipe, and sprays the water outward from the first nozzle and the second nozzle, so that the first nozzle and the second nozzle spray out a water curtain to form a protective anti-interference layer to block the turbulence in the water. The underwater peristaltic pump is started to drive the connecting plate and the peristaltic pump head to transmit the water at the bottom of the constant pressure airbag to the first limit block and the second nozzle through the first connecting pipe. The peristaltic pump head ejects the gas inside the constant pressure airbag from the inside of the third connecting tube, so that the gas inside the third connecting tube goes to the lower slider and the lower through tube, and ejects from the jet needle, so that the jet needle ejects gas outward, and at the same time, another first connecting tube evacuates the upper slider and the upper through tube, so that the suction needle evacuates air, and a bubble is formed between the suction needle and the jet needle. The micro-gas column generation module uses the first laser pulse to induce a cavitation bubble in the water. When the bubble expands to a certain extent, the second laser breaks down near the interface between the bubble and the liquid to generate plasma, which can greatly enhance the LIBS radiation and prolong the plasma life. By adopting the scheme of millimeter-level stable micro-gas column, a gas-liquid interface is established at the laser excitation site.

[0020] 2. The underwater in-situ detection system based on laser induced breakdown spectroscopy technology is driven by a hydraulic cylinder to move the toothed plate, which drives the first limit block to move, so that the first limit block drives the first fixed block and the first nozzle to move, and the toothed plate drives the two third gears to rotate, thereby causing the two third gears to rotate and drive the two first gears to rotate, so that the two first gears drive the two first support rods to rotate when rotating, and when the first support rod rotates, it drives the second gear to rotate, and the second gear drives the two racks to move relatively, so that the two racks drive the two moving blocks to move, and the two moving blocks drive the two second limit blocks and the second nozzle to move, so that the first nozzle and the two second nozzles move synchronously, and the positions of the second nozzle and the first nozzle are adjusted to facilitate the adjustment of the anti-interference protection layer.

[0021] 3. The underwater in-situ detection system based on laser induced breakdown spectroscopy technology is started by an underwater motor to drive the transmission gear to rotate, and the transmission gear drives the ring gear to rotate. When the ring gear rotates, it drives the rotating sleeve to rotate, and the rotating sleeve is limited by the limiting groove, so that the rotating sleeve drives the guide block to rotate, and the guide block drives the threaded sleeve to rotate. The threaded sleeve is threadedly connected with the limiting plate. When the threaded sleeve rotates, the threaded sleeve moves horizontally to one side, so that the threaded sleeve drives the guide block to move, and drives the first fixed plate to move, and the position of the first fixed plate is adjusted, so that the first fixed plate drives the side plate and the second fixed plate to move, and when the second fixed plate moves, it drives the upper slider and the lower slider to move, and the suction needle and the jet needle are adjusted.

[0022] 4. The underwater in-situ detection system based on laser induced breakdown spectroscopy technology, the bottom of the constant pressure airbag is connected to the external water body through a connecting pipe, so that the internal pressure of the constant pressure airbag is always consistent with the external pressure, providing a stable gas source for the micro-gas column. At the same time, the carrier gas system in the underwater peristaltic pump recycles the ejected gas through the suction needle, which can maximize the working time. During operation, the underwater peristaltic pump pumps the gas in the constant pressure airbag into the pipeline, and the air is ejected from the jet needle. At the same time, the underwater peristaltic pump pumps the clean seawater at the bottom of the constant pressure airbag into the second nozzle and the first nozzle to spray it out, so as to achieve the purpose of protecting the gas column. The suction needle inhales the gas and part of the liquid sample to form a millimeter-level continuous and stable micro-gas column. The gas and part of the liquid sample captured by the suction needle are re-injected into the bottom of the constant pressure airbag through the lower slider, and the gas therein floats back to the top of the constant pressure airbag to complete the gas recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a side view schematic diagram of the present invention;

[0025] Figure 3 It is a structural schematic diagram of the first fixing plate of the present invention;

[0026] Figure 4 is a schematic structural diagram of the second fixing plate of the present invention;

[0027] Figure 5 It is a structural schematic diagram of the rotating sleeve of the present invention;

[0028] Figure 6 It is a structural schematic diagram of the support plate of the present invention;

[0029] Figure 7 It is a structural schematic diagram of the tooth plate of the present invention;

[0030] Figure 8It is a structural schematic diagram of the hydraulic cylinder of the present invention;

[0031] Fig. 9 It is a schematic diagram of the structure of the air suction needle and the air jet needle of the present invention;

[0032] Fig.10 It is a schematic diagram of the structure of the rack of the present invention;

[0033] Fig.11 It is a structural schematic diagram of the support plate of the present invention;

[0034] Fig.12 It is a structural schematic diagram of the tooth plate of the present invention;

[0035] Fig.13 It is a structural schematic diagram of the threaded sleeve of the present invention;

[0036] Fig.14 It is a schematic structural diagram of the rotating sleeve of the present invention.

[0037] In the figure: 1, base; 2, bracket; 3, micro air column generating module; 4, underwater peristaltic pump; 5, fixing frame; 6, constant pressure air bag; 7, connecting plate; 8, peristaltic pump head; 9, first connecting pipe; 10, second connecting pipe; 11, third connecting pipe; 12, first fixing plate; 13, side plate; 14, second fixing plate; 15, upper slider; 16, upper through pipe; 17, suction needle; 18, lower slider; 19, lower through pipe; 20, air jet needle; 21, supporting plate; 22, first slide groove; 23, first fixing block; 24, first nozzle; 25, first limit block; 26, positioning plate ; 27. Hydraulic cylinder; 28. Spring; 29. ​​Tooth plate; 30. Second slide groove; 31. Second limit block; 32. Second nozzle; 33. Moving block; 34. Rack; 35. First support rod; 36. First gear; 37. Second gear; 38. Second support rod; 39. Third gear; 40. Cross plate; 41. Support block; 42. Rotating sleeve; 43. Threaded sleeve; 44. Guide block; 45. Limit plate; 46. Telescopic sleeve; 47. Gear ring; 48. Underwater motor; 49. Transmission gear; 50. Swivel; 51. Limit groove; 52. Support seat; 53. Threaded rod. DETAILED DESCRIPTION

[0038] An embodiment of the present invention provides an underwater in-situ detection system based on laser induced breakdown spectroscopy technology.

[0039] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10, Fig.11 , Fig.12 , Fig.13 and Fig.14 , including a base 1, a bracket 2 is fixedly connected to the top of the base 1, a micro-air column generating module 3 is fixedly connected inside the bracket 2, an underwater peristaltic pump 4 is fixedly connected to the top of the bracket 2, a fixing frame 5 is fixedly connected to one side of the top of the base 1, a constant pressure airbag 6 is fixedly connected inside the fixing frame 5, a connecting plate 7 is fixedly connected to the output end of the underwater peristaltic pump 4, three peristaltic pump heads 8 are fixedly connected to the front side of the connecting plate 7, a pipe communicating with the outside is arranged at the bottom of the constant pressure airbag 6, the three peristaltic pump heads 8 are all connected to the output end of the underwater peristaltic pump 4, a peristaltic pump head 8 is started, both sides of which are fixedly connected to the first connecting pipe 9, the two first connecting pipes 9 are respectively connected to the suction needle 17 and the air jet needle 20, the second peristaltic pump head 8 is fixedly connected to the third connecting pipe 11 on both sides, the two third connecting pipes 11 are respectively fixedly connected to the constant pressure airbag 6, the last peristaltic pump head 8 is fixedly connected to the second connecting pipe 10 on both sides, the two second connecting pipes 10 are respectively connected to the suction needle 17 and the air jet needle 20, A micro-air column generating module 3 is provided with an adjusting component at one end, and a first fixing plate 12 is provided at one side of the adjusting component. A plurality of side plates 13 are fixedly connected to one side of the first fixing plate 12, and a second fixing plate 14 is fixedly connected to one side of the plurality of side plates 13. An upper slider 15 and a lower slider 18 are respectively slidably connected inside the second fixing plate 14, and a threaded rod 53 is rotatably connected to one side of the upper slider 15 and the lower slider 18. The two threaded rods 53 respectively penetrate the upper and lower ends of the second fixing plate 14 and are threadedly connected to the second fixing plate 14. The two threaded rods 53 extend to the outer side of the second fixing plate 14 and are fixedly connected to a handle at one end. The upper slider 15 is moved by rotating the threaded rod 53 to adjust the upper slider 15. An upper through pipe 16 is fixedly connected to one side of the upper slider 15, and an air suction needle 17 is fixedly connected to one end of the upper through pipe 16. A lower through pipe 19 is fixedly connected to one side of the lower slider 18, and an air jet needle 20 is fixedly connected to one end of the lower through pipe 19, and the air suction needle 17 corresponds to the air jet needle 20.

[0040] The first fixed plate 12 is fixedly connected to a support plate 21 at the bottom, a first slide groove 22 is provided inside the support plate 21, a transverse plate 40 is fixedly connected to both sides of the support plate 21, a second slide groove 30 is provided inside the two transverse plates 40, a first fixed block 23 is slidably connected inside the first slide groove 22, a first nozzle 24 is fixedly connected to the top of the first fixed block 23, a second limiting block 31 is slidably connected inside the two second slide grooves 30, a second nozzle 32 is fixedly connected to the top of the two second limiting blocks 31, a positioning plate 26 is fixedly connected to the bottom of the support plate 21, and one side of the positioning plate 26 is fixed A hydraulic cylinder 27 is fixedly connected, and a tooth plate 29 is fixedly connected to the output end of the hydraulic cylinder 27. A spring 28 is sleeved on the outer side of the output end of the hydraulic cylinder 27. The two ends of the spring 28 are respectively fitted with the tooth plate 29 and the hydraulic cylinder 27. A first limit block 25 is fixedly connected to the top of the front side of the tooth plate 29. The first limit block 25 is fixedly connected to the bottom of the first fixed block 23. When the hydraulic cylinder 27 is started, the tooth plate 29 is driven to move, so that the tooth plate 29 drives the first limit block 25 to move, and the first limit block 25 drives the first fixed block 23 and the first nozzle 24 to move. The bottom of the two second limit blocks 31 The two moving blocks 33 are fixedly connected to each other, and one side of the two moving blocks 33 is fixedly connected to a rack 34. The two racks 34 are arranged opposite to each other. The two sides of the bottom of the support plate 21 are fixedly connected to support blocks 41. The two racks 34 respectively penetrate the two support blocks 41 and are slidably connected to the two support blocks 41, so that the support blocks 41 support the racks 34, so that the moving blocks 33 drive the racks 34 to move. The two sides of the bottom of the support plate 21 are rotatably connected to the first support rods 35, and the outer sides of the two first support rods 35 are fixedly connected to the first gears 36. The outer bottoms of the two first support rods 35 are fixed A second gear 37 is connected, so that the first support rod 35 drives the first gear 36 and the second gear 37 to rotate synchronously, and the second support rods 38 are rotatably connected to both sides of the bottom of the support plate 21, and the tops of the two second support rods 38 are fixedly connected to the third gear 39, and the two third gears 39 are respectively meshed and connected with the two first gears 36, and the two third gears 39 are respectively meshed and connected to the two sides of the toothed plate 29, so that the toothed plate 29 drives the two third gears 39 to rotate when it moves, thereby driving the two first gears 36 to rotate, and thereby driving the two first support rods 35 and the second gear 37 to rotate.

[0041] The adjusting component includes a rotating sleeve 42, a threaded sleeve 43 is arranged inside the rotating sleeve 42, and a through groove is concentrically arranged inside the rotating sleeve 42 and the threaded sleeve 43. The outlet of the built-in laser emitter of the micro-air column generating module 3 corresponds to the through groove, so that the laser emitter inside the micro-air column generating module 3 can emit the laser through the through groove without blocking the laser. Limiting grooves 51 are arranged on both sides of the rotating sleeve 42, and both sides of one end of the threaded sleeve 43 are fixedly connected with guide blocks 44. The two guide blocks 44 are respectively slidably connected to the inside of the two limiting grooves 51, so that the limiting grooves 51 limit the guide blocks 44, so that the rotating sleeve 42 drives the guide blocks 44 and the threaded sleeve 43 to rotate. The front side of the micro-air column generating module 3 is fixedly connected with a support seat 52, and both sides of the front end of the support seat 52 are fixedly connected with telescopic sleeve rods 46. The outer sides of the two telescopic sleeve rods 46 are fixedly connected. The limit plate 45 is fixedly connected, and the threaded sleeve 43 passes through the limit plate 45 and is threadedly connected with the limit plate 45. When the limit plate 45 limits the threaded sleeve 43, the threaded sleeve 43 moves to one side when rotating. The front end of the limit plate 45 is rotatably connected with a swivel 50, and the swivel 50 is fixedly connected to the first fixed plate 12, so that the threaded sleeve 43 drives the swivel 50 and the first fixed plate 12 to move. The two telescopic sleeves 46 are slidably connected with sliding rods inside, and the first fixed plate 12 is fixedly connected to the two sliding rods. The rotating sleeve 42 is rotatably connected to the inside of the support seat 52, and the front side of the support seat 52 is fixedly connected to the underwater motor 48. The output end of the underwater motor 48 is fixedly connected with a transmission gear 49, and the transmission gear 49 is meshed with the ring gear 47, so that the underwater motor 48 starts to drive the transmission gear 49 to rotate, and drives the ring gear 47 and the rotating sleeve 42 to rotate.

[0042] Specifically, the system is suspended in the water, or the device is installed on the outside of the AUV, and the AUV is loaded into the water for operation. When the position is reached, before the detection, the underwater peristaltic pump 4 is started to drive the connecting plate 7 and the peristaltic pump head 8, so that the peristaltic pump head 8 transmits the water at the bottom end of the constant pressure airbag 6 to the first limit block 25 and the second nozzle 32 through the first connecting pipe 9, and sprays the water outward from the first nozzle 24 and the second nozzle 32, so that the first nozzle 24 and the second nozzle 32 spray a water curtain outward to form a protective anti-interference layer to block the turbulence in the water, and the peristaltic pump head 8 is driven by the underwater peristaltic pump 4 to transfer the water inside the constant pressure airbag 6 The gas is ejected from the inside of the third connecting tube 11, so that the gas inside the third connecting tube 11 flows to the lower slider 18 and the lower through pipe 19, and ejected from the air jet needle 20, so that the air jet needle 20 ejects gas outward, and at the same time, the other first connecting tube 9 evacuates the upper slider 15 and the upper through pipe 16, so that the air suction needle 17 is evacuated, and a bubble is formed between the air suction needle 17 and the air jet needle 20, and a cavitation bubble is first induced in the water by the first laser pulse through the micro-gas column generating module 3. When the bubble expands to a certain extent, the second laser breaks down near the interface between the bubble and the liquid to generate plasma, which can greatly enhance the LIBS radiation and prolong the plasma life. By adopting the scheme of millimeter-level stable micro-gas column, a gas-liquid interface is established at the laser excitation point.

[0043] The hydraulic cylinder 27 is started to drive the toothed plate 29 to move, and the toothed plate 29 drives the first limit block 25 to move, so that the first limit block 25 drives the first fixed block 23 and the first nozzle 24 to move, so that the toothed plate 29 drives the two third gears 39 to rotate, thereby causing the two third gears 39 to rotate, and driving the two first gears 36 to rotate, so that the two first gears 36 drive the two first support rods 35 to rotate when rotating, and when the first support rod 35 rotates, it drives the second gear 37 to rotate, and causes the second gear 37 to drive the two racks 34 to move relatively, so that the two racks 34 drive the two moving blocks 33 to move, so that the two moving blocks 33 drive the two second limit blocks 31 and the second nozzle 32 to move, so that the first nozzle 24 and the two second nozzles 32 move synchronously, and the positions of the second nozzles 32 and the first nozzle 24 are adjusted, so as to facilitate the adjustment of the anti-interference protection layer.

[0044] The underwater motor 48 is started to drive the transmission gear 49 to rotate, and the transmission gear 49 drives the ring gear 47 to rotate. When the ring gear 47 rotates, it drives the rotating sleeve 42 to rotate, so that the rotating sleeve 42 is limited by the limiting groove 51, so that the rotating sleeve 42 drives the guide block 44 to rotate, and the guide block 44 drives the threaded sleeve 43 to rotate. The threaded sleeve 43 is threadedly connected with the limiting plate 45. When the threaded sleeve 43 rotates, the threaded sleeve 43 moves horizontally to one side, so that the threaded sleeve 43 drives the guide block 44 to move, and drives the first fixed plate 12 to move, and adjusts the position of the first fixed plate 12, so that the first fixed plate 12 drives the side plate 13 and the second fixed plate 14 to move. When the second fixed plate 14 moves, it drives the upper slider 15 and the lower slider 18 to move, and adjusts the suction needle 17 and the jet needle 20.

[0045] The bottom of the constant pressure airbag 6 is connected to the external water body through a connecting pipe, so that the internal pressure of the constant pressure airbag 6 is always consistent with the external pressure, providing a stable air source for the micro air column. At the same time, the carrier gas system in the underwater peristaltic pump 4 recycles the ejected gas through the suction needle 17, so that the working time can be guaranteed to the maximum extent. During operation, the underwater peristaltic pump 4 pumps the gas in the constant pressure airbag 6 into the pipeline, and the air is ejected from the jet needle 20. At the same time, the underwater peristaltic pump 4 pumps the clean seawater at the bottom of the constant pressure airbag 6 into the second nozzle 32 and the first nozzle 24 to spray out, so as to achieve the purpose of protecting the air column. The suction needle 17 inhales gas and part of the liquid sample to form a millimeter-level continuous and stable micro air column. The gas and part of the liquid sample captured by the suction needle 17 are re-injected into the bottom of the constant pressure airbag 6 through the lower slider 18, and the gas therein floats back to the top of the constant pressure airbag 6 to complete the gas recovery.

[0046] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An underwater in-situ detection system based on laser induced breakdown spectroscopy technology, comprising a base (1), characterized in that: The top of the base (1) is fixedly connected to a bracket (2), the inside of the bracket (2) is fixedly connected to a micro-air column generating module (3), the top of the bracket (2) is fixedly connected to an underwater peristaltic pump (4), one side of the top of the base (1) is fixedly connected to a fixing frame (5), the inside of the fixing frame (5) is fixedly connected to a constant pressure air bag (6), the output end of the underwater peristaltic pump (4) is fixedly connected to a connecting plate (7), the front side of the connecting plate (7) is fixedly connected to three peristaltic pump heads (8), one end of the micro-air column generating module (3) is provided with an adjustment component, one side of the adjustment component is provided with a first fixing plate (12), the first fixing plate (12 ) is fixedly connected to one side of a plurality of side plates (13), one side of the plurality of side plates (13) is fixedly connected to a second fixed plate (14), an upper slider (15) and a lower slider (18) are slidably connected inside the second fixed plate (14) up and down, respectively, one side of the upper slider (15) is fixedly connected to an upper through pipe (16), one end of the upper through pipe (16) is fixedly connected to an air suction needle (17), one side of the lower slider (18) is fixedly connected to a lower through pipe (19), one end of the lower through pipe (19) is fixedly connected to an air jet needle (20), the air suction needle (17) corresponds to the air jet needle (20), and the bottom of the first fixed plate (12) is fixedly connected to the upper through pipe (16). A support plate (21) is connected, a first slide groove (22) is provided inside the support plate (21), both sides of the support plate (21) are fixedly connected with a transverse plate (40), a second slide groove (30) is provided inside the two transverse plates (40), a first fixed block (23) is slidably connected inside the first slide groove (22), a first nozzle (24) is fixedly connected to the top of the first fixed block (23), a second limit block (31) is slidably connected inside the two second slide grooves (30), a second nozzle (32) is fixedly connected to the top of the two second limit blocks (31), and a pipeline communicating with the outside is provided at the bottom of the constant pressure airbag (6), The three peristaltic pump heads (8) are all connected to the output end of the underwater peristaltic pump (4). When one of the peristaltic pump heads (8) is started, both sides are fixedly connected with the first connecting tubes (9), and the two first connecting tubes (9) are respectively connected with the suction needle (17) and the air jet needle (20). The second peristaltic pump head (8) is fixedly connected with the third connecting tubes (11) on both sides, and the two third connecting tubes (11) are respectively fixedly connected with the constant pressure airbag (6). The last peristaltic pump head (8) is fixedly connected with the second connecting tubes (10) on both sides, and the two second connecting tubes (10) are respectively connected with the suction needle (17) and the air jet needle (20).

2. The underwater in-situ detection system based on laser induced breakdown spectroscopy technology according to claim 1 is characterized in that: The bottom of the support plate (21) is fixedly connected to a positioning plate (26), one side of the positioning plate (26) is fixedly connected to a hydraulic cylinder (27), the output end of the hydraulic cylinder (27) is fixedly connected to a toothed plate (29), the outer side of the output end of the hydraulic cylinder (27) is sleeved with a spring (28), the two ends of the spring (28) are respectively fitted with the toothed plate (29) and the hydraulic cylinder (27), the top of the front side of the toothed plate (29) is fixedly connected to a first limiting block (25), and the first limiting block (25) is fixedly connected to the bottom of the first fixed block (23).

3. The underwater in-situ detection system based on laser induced breakdown spectroscopy technology according to claim 1 is characterized in that: The bottoms of the two second limit blocks (31) are fixedly connected to moving blocks (33), one side of the two moving blocks (33) is fixedly connected to racks (34), the two racks (34) are arranged opposite to each other, the bottom sides of the support plate (21) are fixedly connected to support blocks (41), and the two racks (34) respectively penetrate the two support blocks (41) and are slidably connected to the two support blocks (41).

4. The underwater in-situ detection system based on laser induced breakdown spectroscopy technology according to claim 1 is characterized in that: Both sides of the bottom of the support plate (21) are rotatably connected to first support rods (35), the outer sides of the two first support rods (35) are fixedly connected to first gears (36), and the outer bottoms of the two first support rods (35) are fixedly connected to second gears (37).

5. The underwater in-situ detection system based on laser induced breakdown spectroscopy technology according to claim 4 is characterized in that: The bottom of the support plate (21) is rotatably connected to a second support rod (38) on both sides, and the tops of the two second support rods (38) are fixedly connected to a third gear (39), the two third gears (39) are respectively meshed and connected to the two first gears (36), and the two third gears (39) are respectively meshed and connected to the two sides of the toothed plate (29).

6. The underwater in-situ detection system based on laser induced breakdown spectroscopy technology according to claim 1 is characterized in that: The adjustment component comprises a rotating sleeve (42), a threaded sleeve (43) is arranged inside the rotating sleeve (42), a through groove is coaxially arranged inside the rotating sleeve (42) and the threaded sleeve (43), and the micro-air column generating module (3) has a built-in laser emitter outlet corresponding to the through groove.

7. The underwater in-situ detection system based on laser induced breakdown spectroscopy technology according to claim 6 is characterized by: Limiting grooves (51) are provided on both sides of the rotating sleeve (42), and guide blocks (44) are fixedly connected to both sides of one end of the threaded sleeve (43), and the two guide blocks (44) are slidably connected to the inside of the two limiting grooves (51) respectively.

8. The underwater in-situ detection system based on laser induced breakdown spectroscopy technology according to claim 7 is characterized in that: The front side of the micro-air column generating module (3) is fixedly connected to a support seat (52), and both sides of the front end of the support seat (52) are fixedly connected to telescopic sleeves (46). The outer sides of the two telescopic sleeves (46) are fixedly connected to a limit plate (45), and the threaded sleeve (43) passes through the limit plate (45) and is threadedly connected to the limit plate (45). The front end of the limit plate (45) is rotatably connected to a swivel (50), and the swivel (50) is fixedly connected to the first fixed plate (12). The insides of the two telescopic sleeves (46) are slidably connected to sliding rods, and the first fixed plate (12) is fixedly connected to the two sliding rods. The rotating sleeve (42) is rotatably connected to the inside of the support seat (52), and the front side of the support seat (52) is fixedly connected to an underwater motor (48), and the output end of the underwater motor (48) is fixedly connected to a transmission gear (49), and the transmission gear (49) is meshedly connected to the ring gear (47).

9. The underwater in-situ detection system based on laser induced breakdown spectroscopy technology according to claim 1, characterized in that: One side of the upper slider (15) and the lower slider (18) are both rotatably connected to a threaded rod (53), the two threaded rods (53) respectively penetrate the upper and lower ends of the second fixing plate (14) and are threadedly connected to the second fixing plate (14), and one end of the two threaded rods (53) extending to the outside of the second fixing plate (14) is fixedly connected to a handle.

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